/troh"neuh/, n.a monoclinic mineral, grayish or yellowish hydrous sodium carbonate and bicarbonate, Na2CO3·NaHCO3·2H2, occurring in dried or partly evaporated lake basins.[1790-1800; < Sp < dial. Ar tron, aph. var. of NATRUN NATRON]
* * *▪ mineralan evaporite mineral, hydrated sodium bicarbonate [Na3H(CO3)2·2H2O], occasionally encountered as a saline lake deposit or evaporation product and as an efflorescence on arid soil. Usually associated with natron, thermonatrite, halite, and gypsum, it occurs near Memphis, in the Lower Nile Valley; widely in the soda lakes of Africa, Armenia, Iran, and the western United States; and in the alkali deserts of Mongolia and Tibet. For detailed physical properties, see carbonate mineral (table).
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